If we wanted to add a red straight regression line to the scatter plot below, which of the following commands should we add to the code?





a.



+ geom_smooth(colour = "Red")



b.



+ geom_smooth(method = "lm")



c.



+ geom_smooth(method = "lm", colour = "Red")



d.



+ geom_straight(method = "lm", colour = "Red")


c.


+ geom_smooth(method = "lm", colour = "Red")

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